Some NDT Terms...

TRUE POSITIVE = hit (relevant indication or defect found after a 2nd test)

FALSE POSITIVE = false call (thought it was a hit or defect or an relevant indication, but was actually a miss or non-relevant indication from a 2nd test)

FALSE NEGATIVE = correct accept (thought it was a miss or an non-relevant indiction, but was actually a hit or defect or relevant indication from a 2nd test)

TRUE NEGATIVE = miss (non-relevant indication found after a 2nd test)